_SEP 16 1963-DEC 19 1977 ORDINANCES 4 COUNCIL

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s • The portion of the stack above the offset shall be sized as 22.1-87. Table 2 -Fixtures Not Listed In Table 1 Shall Be With Table 2. for a regular stack based on the total number of fixtures above Estimated in Accordance the offset. Fixture Drain or Trap Size Fixture Unit Value The offset shall be sized as for a building drain. (Table 3, 11/z inches and smaller 1 Col. 5.) 11. inches 2 2 The portion of the stack below the offset shall be sized as 2 inches 3 21/2 inches 4 for the offset or based on the total number of fixture units on 3 inches 5 the entire stack, whichever is the larger. ( See Table 4, Col. 4.) 4 inches 6 A relief vent for the offset shall be installed as provided in Sec. 22.1-116 (b) (c) (d) and in no case shall the horizontal 22.1-88. Valves for Continuous Flow. branch connect to the stack with 2 feet above or below the For a continuous or semi -continuous flow into a drainage offset.um ejector, air conditioning system, such as from a pump, pump e j equipment or similar device, two fixture units shall be allowed 22.1-85. Fixture Units. for each gallon -per -minute of flow. Fixture unit values as given in Table 1 designate the relative 22.1-89. Determination of Sizes for the Drainage System. load weight of different kinds of fixtures which shall be em- ployed in estimating the total load carried by soil waste pipe Maximum fixture unit load. The maximum number of fix - and shall be used in connection with the tables of sizes for ture units that may be connected to a given size of building soil, waste, and rain pipe for which the permissible load is sewer, building drain, horizontal branch, or vertical soil or given in terms of fixture units. waste stack is given in Tables 3 and 4. 22.1-90. Table 3 -Building Drains and Sewers. Diameter Maximum Number of Fixture Units That May of be Connected to Any Portion' of the Building • Pipe Drain or the Building Sewer Fall Per Foot 1/16 Inch 1/8 Inch 1/t Inch 1/2 Inch Inches 2 21 26 21i, 24 31 3 202 272 362 4 180 216 250 5 390 480 575 6 700 840 1000 8 1400 1600 1920 2300 10 2500 2900 3500 4200 12 3900 4600 5600 6700 15 7000 8300 10000 12000 1. Includes branches of the Building Drain. 2. No water closet shall be connected to a 3 inch horizontal drain greater than 3 feet in length. 22.1-91. Table 4 -Horizontal Fixture Branches and Stacks. 22.1-86. Table 1 -Fixture Units Per Fixture or Group. Maximum Number of Fixture Units That May Be Connected to: Minimum Size 2 Fixture -Unit Value of Trap One Stack Of More Than 3 Stories In Height Fixture Type As Load Factors In Inches F Any 3 Stories In Total for Total At One Horizontal) Height of3 Stack Story of Branch 1 Bathroom group consisting Tank Water Closet Inches Fixture Branch Intervals Interval of water closet, lavatory, 6 bathtub or shower stall Flush -Valve 11/4 1 2 2 1 Water Closet 8 11/2 3 4 8 2 Bathtub 1 (with or without over -head shower) 2 11�i 2 6 10 24 6 Bidet 3 2 - Combination sink -and -tray 3 Nominal 11/2 21/2 12 20 42 9 Combination sink -and -tray 11/2 3 202 303 60" 16` with food 3 Disposal Unit ods lqr. -. 4 Separate1 4 106 240 500 90 Dental Unit or Cuspidor 1 traps i 5 360 540 1100 200 Dental Lavatory 1 11/4 6 620 960 1900 350 Drinking Fountain 1/2 1 Dishwasher 2 Domestic 1 2 11/2 8 1400 2200 3600 600 Floor Drains 3 1 it/2 10 2500 3800 5600 1000 Kitchen Sink, Domestic 2 Kitchen Sink, Domestic, with 11/2 12 3900 6000 8400 1500 food waste grinder 3 Lavatory 4 1 Small P.O. 11/4 15 7000 Lavatory 1 2 Large P.O. 11/2 Lavatory, barber, beauty 11/2 1. Does not include branches of the Building Drain. parlor 2 2. No Water Closet shall be connected to a 3 inch horizontal branch Lavatory, surgeon's 2 11/z more than 3 feet in length. • Laundry tray (1 or 2 com- 11/2 3. Not over six water closets. partments) Shower stall, domestic 2 2 Shower (group) per head 2 3 22.1-92. Minimum Size of Soil and Waste Stack. Sinks Surgeon's 3 11/2 No soil or waste stack shall be smaller than the largest Flushing rim (with valve) 8 3 Service (trap standard) 3 horizontal branch connected thereto except that a 4 x 3 W. C. p Service (P trap) 2 i�/2 connection shall not be considered as a reduction in pipe size. Pot, scullery, etc. 2 4 Urinal, pedestal, syphon jet, 3 blowout 8 Nominal 11/2 22.1-93. Minimum Size of Stack Vent or Vent Stack. Urinal, wall lip 4 1 Urinal, stall, washout 4 2 Urinal trough 2 (each 2 ft. An structure on which a building drain is installed shall Y section) 2 11/2 have at least one stack vent or vent stack carried full size Wash sink 2 (circular or through the roof not less than 3 inches in diameter. multiple) each set of faucets 2 Nominal 11/2 - Water closet, tank -operated 4 Nominal 3 Water closet, valve -operated 8 3 22.1-94. Future Fixtures. Domestic washing machine 2 11/2 1. A shower head over a bathtub does not increase the fixture value. When provision is made for the future installation of fix - 2. For determining fixture unit values for fixtures not listed, refer to tures, those provided for shall be considered in determining paragraph: Values For Continuous Flow. the required sizes of drain pipes. Construction to provide 3. Size of floor drain shall be determined by the area of surface water for such future installation shall be terminated with a plugged to be drained. 4. Lavatories with 11/4 or 11/2 inch trap have the same load value; larger fitting or fittings at the stack so as to form no dead end. P.O. plugs have greater flow rate. 0